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<h1 class="title">iconpreviewarea.cpp 示例文件</h1>
<span class="subtitle">widgets/icons/iconpreviewarea.cpp</span>
<!-- $$$widgets/icons/iconpreviewarea.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &lt;QtWidgets&gt;</span>

  <span class="preprocessor">#include &quot;iconpreviewarea.h&quot;</span>

  IconPreviewArea<span class="operator">::</span>IconPreviewArea(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
  {
      <span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>(<span class="keyword">this</span>);

      <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator">&lt;</span> NumStates; <span class="operator">+</span><span class="operator">+</span>row) {
          stateLabels<span class="operator">[</span>row<span class="operator">]</span> <span class="operator">=</span> createHeaderLabel(IconPreviewArea<span class="operator">::</span>iconStateNames()<span class="operator">.</span>at(row));
          mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(stateLabels<span class="operator">[</span>row<span class="operator">]</span><span class="operator">,</span> row <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
      }
      Q_ASSERT(NumStates <span class="operator">=</span><span class="operator">=</span> <span class="number">2</span>);

      <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator">&lt;</span> NumModes; <span class="operator">+</span><span class="operator">+</span>column) {
          modeLabels<span class="operator">[</span>column<span class="operator">]</span> <span class="operator">=</span> createHeaderLabel(IconPreviewArea<span class="operator">::</span>iconModeNames()<span class="operator">.</span>at(column));
          mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(modeLabels<span class="operator">[</span>column<span class="operator">]</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> column <span class="operator">+</span> <span class="number">1</span>);
      }
      Q_ASSERT(NumModes <span class="operator">=</span><span class="operator">=</span> <span class="number">4</span>);

      <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator">&lt;</span> NumModes; <span class="operator">+</span><span class="operator">+</span>column) {
          <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator">&lt;</span> NumStates; <span class="operator">+</span><span class="operator">+</span>row) {
              pixmapLabels<span class="operator">[</span>column<span class="operator">]</span><span class="operator">[</span>row<span class="operator">]</span> <span class="operator">=</span> createPixmapLabel();
              mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(pixmapLabels<span class="operator">[</span>column<span class="operator">]</span><span class="operator">[</span>row<span class="operator">]</span><span class="operator">,</span> row <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> column <span class="operator">+</span> <span class="number">1</span>);
          }
      }
  }

  <span class="preprocessor">#ifdef Q_COMPILER_INITIALIZER_LISTS</span>

  <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Mode<span class="operator">&gt;</span> IconPreviewArea<span class="operator">::</span>iconModes()
  {
      <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Mode<span class="operator">&gt;</span> result <span class="operator">=</span> {<span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Normal<span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Active<span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Disabled<span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Selected};
      <span class="keyword">return</span> result;
  }

  <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>State<span class="operator">&gt;</span> IconPreviewArea<span class="operator">::</span>iconStates()
  {
      <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>State<span class="operator">&gt;</span> result <span class="operator">=</span> {<span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Off<span class="operator">,</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>On};
      <span class="keyword">return</span> result;
  }

  <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> IconPreviewArea<span class="operator">::</span>iconModeNames()
  {
      <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> result <span class="operator">=</span> {tr(<span class="string">&quot;Normal&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;Active&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;Disabled&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;Selected&quot;</span>)};
      <span class="keyword">return</span> result;
  }

  <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> IconPreviewArea<span class="operator">::</span>iconStateNames()
  {
      <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> result <span class="operator">=</span> {tr(<span class="string">&quot;Off&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;On&quot;</span>)};
      <span class="keyword">return</span> result;
  }

  <span class="preprocessor">#else // Q_COMPILER_INITIALIZER_LISTS</span>

  <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Mode<span class="operator">&gt;</span> IconPreviewArea<span class="operator">::</span>iconModes()
  {
      <span class="keyword">static</span> <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Mode<span class="operator">&gt;</span> result;
      <span class="keyword">if</span> (result<span class="operator">.</span>isEmpty())
          result <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Normal <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Active <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Disabled <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Selected;
      <span class="keyword">return</span> result;
  }

  <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>State<span class="operator">&gt;</span> IconPreviewArea<span class="operator">::</span>iconStates()
  {
      <span class="keyword">static</span> <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator">&lt;</span><span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>State<span class="operator">&gt;</span> result;
      <span class="keyword">if</span> (result<span class="operator">.</span>isEmpty())
          result <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>Off <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span><span class="operator">::</span>On;
      <span class="keyword">return</span> result;
  }

  <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> IconPreviewArea<span class="operator">::</span>iconModeNames()
  {
      <span class="keyword">static</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> result;
      <span class="keyword">if</span> (result<span class="operator">.</span>isEmpty())
          result <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Normal&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Active&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Disabled&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Selected&quot;</span>);
      <span class="keyword">return</span> result;
  }

  <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> IconPreviewArea<span class="operator">::</span>iconStateNames()
  {
      <span class="keyword">static</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> result;
      <span class="keyword">if</span> (result<span class="operator">.</span>isEmpty())
          result <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Off&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;On&quot;</span>);
      <span class="keyword">return</span> result;
  }

  <span class="preprocessor">#endif // !Q_COMPILER_INITIALIZER_LISTS</span>

  <span class="type">void</span> IconPreviewArea<span class="operator">::</span>setIcon(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qicon.html">QIcon</a></span> <span class="operator">&amp;</span>icon)
  {
      <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>icon <span class="operator">=</span> icon;
      updatePixmapLabels();
  }

  <span class="type">void</span> IconPreviewArea<span class="operator">::</span>setSize(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> <span class="operator">&amp;</span>size)
  {
      <span class="keyword">if</span> (size <span class="operator">!</span><span class="operator">=</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>size) {
          <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>size <span class="operator">=</span> size;
          updatePixmapLabels();
      }
  }

  <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>IconPreviewArea<span class="operator">::</span>createHeaderLabel(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>text)
  {
      <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>label <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;&lt;b&gt;%1&lt;/b&gt;&quot;</span>)<span class="operator">.</span>arg(text));
      label<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter);
      <span class="keyword">return</span> label;
  }

  <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>IconPreviewArea<span class="operator">::</span>createPixmapLabel()
  {
      <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>label <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
      label<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
      label<span class="operator">-</span><span class="operator">&gt;</span>setAlignment(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter);
      label<span class="operator">-</span><span class="operator">&gt;</span>setFrameShape(<span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>Box);
      label<span class="operator">-</span><span class="operator">&gt;</span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding);
      label<span class="operator">-</span><span class="operator">&gt;</span>setBackgroundRole(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Base);
      label<span class="operator">-</span><span class="operator">&gt;</span>setAutoFillBackground(<span class="keyword">true</span>);
      label<span class="operator">-</span><span class="operator">&gt;</span>setMinimumSize(<span class="number">132</span><span class="operator">,</span> <span class="number">132</span>);
      <span class="keyword">return</span> label;
  }

  <span class="type">void</span> IconPreviewArea<span class="operator">::</span>updatePixmapLabels()
  {
      <span class="type"><a href="../qtgui/qwindow.html">QWindow</a></span> <span class="operator">*</span>window <span class="operator">=</span> nullptr;
      <span class="keyword">if</span> (<span class="keyword">const</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>nativeParent <span class="operator">=</span> nativeParentWidget())
          window <span class="operator">=</span> nativeParent<span class="operator">-</span><span class="operator">&gt;</span>windowHandle();
      <span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator">&lt;</span> NumModes; <span class="operator">+</span><span class="operator">+</span>column) {
          <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator">&lt;</span> NumStates; <span class="operator">+</span><span class="operator">+</span>row) {
              <span class="keyword">const</span> <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap <span class="operator">=</span>
                  icon<span class="operator">.</span>pixmap(window<span class="operator">,</span> size<span class="operator">,</span> IconPreviewArea<span class="operator">::</span>iconModes()<span class="operator">.</span>at(column)<span class="operator">,</span>
                              IconPreviewArea<span class="operator">::</span>iconStates()<span class="operator">.</span>at(row));
              <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>pixmapLabel <span class="operator">=</span> pixmapLabels<span class="operator">[</span>column<span class="operator">]</span><span class="operator">[</span>row<span class="operator">]</span>;
              pixmapLabel<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(pixmap);
              pixmapLabel<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="operator">!</span>pixmap<span class="operator">.</span>isNull());
              <span class="type"><a href="../qtcore/qstring.html">QString</a></span> toolTip;
              <span class="keyword">if</span> (<span class="operator">!</span>pixmap<span class="operator">.</span>isNull()) {
                  <span class="keyword">const</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> actualSize <span class="operator">=</span> icon<span class="operator">.</span>actualSize(size);
                  toolTip <span class="operator">=</span>
                      tr(<span class="string">&quot;Size: %1x%2\nActual size: %3x%4\nDevice pixel ratio: %5&quot;</span>)
                          <span class="operator">.</span>arg(size<span class="operator">.</span>width())<span class="operator">.</span>arg(size<span class="operator">.</span>height())
                          <span class="operator">.</span>arg(actualSize<span class="operator">.</span>width())<span class="operator">.</span>arg(actualSize<span class="operator">.</span>height())
                          <span class="operator">.</span>arg(pixmap<span class="operator">.</span>devicePixelRatioF());
              }
              pixmapLabel<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(toolTip);
          }
      }
  }

</pre>
</div>
<!-- @@@widgets/icons/iconpreviewarea.cpp -->
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